My GT's didnt even heat my house when it was in the teens the night before last. Usually work fine. I woke up to what said 66 but it felt like 56. Wierd. Had to put somehting in so I went down to Lowes and they had Inferno which I had never tried. Damn, one of those times I wish I had a smart phone. Bought 20 bags, actually bought 3 tons of pellets and they will let me pick up whatever at a time and mark of my slip. So....I put them in last night and had to say the house was warm????? But I switched from stove temp to room temp. But the flame...is a greenish color at the base...oh man. Now I am thinking of lugging these back and buying more of Natures Own or Green Supreme.